Overview
The ZF 4699.170.040 MOTOR is a critical hydraulic drive component engineered for precise power delivery within ZF heavy-duty powershift transmissions. This OEM genuine part, identified by SKU 4699.170.040, functions as the primary actuation unit that converts hydraulic pressure into mechanical rotation, directly engaging clutch packs and modulating gear selection in construction machinery. Positioned within the transmission control valve body, this motor ensures smooth shift timing and consistent torque output under extreme load conditions. When paired with the 4699100019: BASIC PARTS kit, it forms the foundation of reliable transmission operation.
Symptoms of Failure
- Delayed or erratic gear engagement – When the motor loses internal seal integrity, hydraulic pressure drops, causing noticeable hesitation when shifting from neutral to drive or reverse.
- Intermittent transmission slipping under load – A worn 4699.170.040 motor cannot maintain consistent clutch pressure, leading to power loss during heavy excavation or grading operations.
- Hydraulic fluid contamination – Internal wear particles from the motor’s rotating assembly can circulate through the system, accelerating damage to the 4699300139: HOUSING and adjacent valve bodies.
- Audible whining or grinding from the transmission – Bearing degradation within the motor produces distinct metallic noises that intensify with engine RPM, often preceding complete hydraulic failure.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4699.170.040 |
| Type | Hydraulic Drive Motor |
| Material | Hardened Alloy Steel / Aluminum Housing |
| Weight | 3.2 kg (7.1 lbs) |
| Max Operating Pressure | 25 bar (362 psi) |
| OEM Reference | ZF 4699.170.040 |
| Mounting Bolt Torque | 45 Nm (33 ft-lbs) |
Compatibility
This motor is designed for integration with ZF WG series powershift transmissions commonly deployed in wheel loaders, telehandlers, and excavators. Verified compatible models include the WG180, WG200, and WG250 series. It directly interfaces with the 4699300156: GEAR SHAFT to transfer rotational force, and its mounting flange aligns precisely with the 4699300127: PLANET CARRIER assembly. For complete rebuilds, always inspect the motor bore within the transmission housing for scoring or wear.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699100019 | BASIC PARTS | Seal and gasket kit for motor installation |
| 4699300139 | HOUSING | Encloses motor and valve assembly |
| 4699300156 | GEAR SHAFT | Transfers motor torque to clutch packs |
| 4699300127 | PLANET CARRIER | Supports planetary gear set rotation |
| 4699300098 | INNER DISK CARRIER | Holds clutch friction disks in alignment |
| 4699200011 | RING GEAR | Outer gear for planetary reduction |
| 4699300152 | TOOTHED DISC | Locks gear shaft to carrier assembly |
| 4699300153 | RING GEAR | Secondary ring gear for high-range output |
| 4699300154 | RING | Retaining ring for bearing preload |
| 4699300128 | PLANETARY GEAR | Individual planet gear for torque splitting |
